Mug lid



FIG. 1 is a perspective view of the mug lid;

FIG. 2 is a right side elevation thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a back elevation view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines illustrate environmental structure and form no part of the claimed design. 

CLAIM We claim the ornamental design for a mug lid, as shown and described. 